Feature Extraction and Classification of VAG Signal of Human Knee for Early Diagnosis of Chondromalacia Patella
01 Jan 2021-pp 2917-2922
TL;DR: In this paper, a piezosensor placed on the patella of the knee was used to extract features of the signal from a VAG signal from different individuals to ascertain if VAG signals can be used for the detection of knee pathologies.
Abstract: Chondromalacia patella is a condition that is often left undiagnosed or misdiagnosed as osteoarthritis. Diagnosis of chondromalacia is difficult and requires CT scans for proper confirmation. Early detection of chondromalacia can prevent further damage to the cartilage. This paper aims at acquiring and processing different VAG signal from various individuals to ascertain if VAG signals can be used for the detection of knee pathologies and conditions like chondromalacia patella. In this paper, our primary discussion revolves around characterization of features of the signal from a piezosensor placed on the patella of the knee. There were marked differences observed between time domain correlation of the extracted characteristics of the VAG signals between subjects with knee pain, those with reported knee pathologies and healthy test subjects. VAG signals could thus be instrumental in early detection of chondromalacia patella and other knee pathologies.
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TL;DR: Current evidence supports the continued use of quadriceps exercise for the conservative management of PFPS, but inconsistent or limited data regarding the other interventions precluded the authors' ability to make conclusive recommendations about their use.
Abstract: Purpose/Background:
Patellofemoral pain syndrome (PFPS) is one of the most common and clinically challenging knee pathologies. Historically, clinicians have used a myriad of interventions, many of which have benefited some but not all patients. Suboptimal outcomes may reflect the need for an evidence-based approach for the treatment of PFPS. The authors believe that integrating clinical expertise with the most current scientific data will enhance clinical practice. The purpose of this systematic review is to provide an update on the evidence for the conservative treatment of PFPS.
126 citations
TL;DR: The purpose of the present investigation was to characterize normal knees and knees affected by osteoarthritis, rheumatoid arthritis, and chondromalacia using a set of noninvasive acceleration measurements.
Abstract: Devising techniques and instrumentation for early detection of knee arthritis and chondromalacia presents a challenge in the domain of biomedical engineering. The purpose of the present investigation was to characterize normal knees and knees affected by osteoarthritis, rheumatoid arthritis, and chondromalacia using a set of noninvasive acceleration measurements. Ultraminiature accelerometers were placed on the skin over the patella in four groups of subjects, and acceleration measurements were obtained during leg rotation. Acceleration measurements were significantly different in the four groups of subjects in the time and frequency domains. Power spectral analysis revealed that the average power was significantly different for these groups over a 100–500 Hz range. Noninvasive acceleration measurements can characterize the normal, arthritis, and chondromalacia knees. However, a study on a larger group of subjects is indicated.
44 citations
TL;DR: Vibration arthrometry has yielded new information on a possible damage mechanism associated with shock vibration that arises during cavitation of synovial fluid.
Abstract: Throughout the ages, physicians have listened to sounds and felt vibrations from human joints in their attempts to diagnose pathology. They have used a wide vocabulary to describe these phenomena, but technology has been slow to provide recording and analytic equipment. Lately, accelerometers have been used with considerable success in a new noninvasive method now known as vibration arthrometry (formerly "arthrography"). The technique has been used in early detection of congenital dislocation of the hip and also in diagnosis of meniscal pathology. More recently, patellar vibration has been used to assess the mechanical properties of articular cartilage. Vibration arthrometry has also yielded new information on a possible damage mechanism associated with shock vibration that arises during cavitation of synovial fluid. Joint vibrations are therefore useful aids to diagnosis and may even be etiologic in orthopedic disease.
41 citations
01 Dec 2016
TL;DR: Knee vibroarthrographic (VAG) signals are investigated in order to suggest possible parameters to detect chondromalacia patella at the early stage and energy and spectral power of the VAG signal were obviously higher than normal VAG signals, particularly in the high frequency bands.
Abstract: Early stage of chondromalacia patella is usually asymptomatic. Detection of chondromalacia patella sooner can delay further cartilage degeneration by appropriate exercise prescription and behavioral change. The purpose of this study is to preliminary examine asymptomatic subjects and investigate the knee vibroarthrographic (VAG) signals in order to suggest possible parameters to detect chondromalacia patella at the early stage. Frequency characteristics of the signals which include energy and the summing of spectral power in each 500 Hz frequency band were observed. Energy and spectral power of the VAG signals with chondromalacia patella were obviously higher than normal VAG signals, particularly in the high frequency bands (higher than 500 Hz). VAG signal is therefore a promising tool in detection of early stage chondromalacia patella.
2 citations